Bryant DURAPAC PLUS 581B User Manual
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VIII. STEP 8 — ADJUST FACTORY-INSTALLED OPTIONS
A. Disconnect Switch
The optional disconnect switch is non-fused. The switch has
the capability of being locked in place for safety purposes.
B. Perfect Humidity™ Dehumidification System
Perfect Humidity system operation can be controlled by field
installation of a Bryant-approved humidistat device (Fig. 13),
or light commercial Thermidistat™ device (Fig. 14). To install
the humidistat device:
1. Route humidistat cable through hole provided in unit
corner post.
2. Feed wires through the raceway built into the corner
post to the 24-v barrier located on the left side of the
control box. See Fig. 12. The raceway provides the
UL-required clearance between high-voltage and low-
voltage wiring.
3. Use a wire nut to connect humidistat cable into low-
voltage wiring as shown in Fig. 15.
To install Thermidistat device:
1. Route Thermidistat cable through hole provided in
unit corner post.
2. Feed the wires through the raceway built into the cor-
ner post to the 24-v barrier located on the left side of
the control box. See Fig. 12. The raceway provides the
UL-required clearance between high and low voltage
wiring.
3. A field-supplied relay must be installed between the
Thermidistat device and the Perfect Humidity circuit
(recommended relay: HN612KK324). See Fig. 16. The
relay coil is connected between the DEHUM output
and C (common) of the unit. The relay controls the
Perfect Humidity solenoid valve and must be wired
between the Perfect Humidity fuse and the low-pres-
sure switch. Refer to the installation instructions
included with the Bryant Light Commercial Thermi-
distat device for more information.
% RELATIVE HUMIDITY
Fig. 13 — Accessory Field-Installed Humidistat Device
Fig. 14 — Light Commercial Thermidistat Device
Fig. 15 — Typical Perfect Humidity Dehumidification System
Humidistat Wiring (208/230-v Unit Shown)
C
— Contactor (Compressor)
CB
— Circuit Breaker
CR
— Cooling Relay
DHR
— Dehumidify Relay
DSV
— Discharge Solenoid Valve
HU
— Humidistat
LPS
—
Low Pressure Switch
LSV
— Liquid Line Solenoid Valve
LTLO
—
Low Temperature Lockout
TRAN
— Transformer
Terminal (Unmarked)
Splice
Factory Wiring
Accessory or Optional Wiring
LEGEND